Boiler-tube.



F. BURKETT.

BOILER TUBE- APPLICATION FILED SEPT. 17. 1912.

1,146,,U5UB Patented July 13, 1915.

Witnesses Attorneys,

ccunuum PLANOGRAPH $0., WASHINGTON, D. c.

FRANK BURKETT, 0F IJUFKIN, TEXAS.

BOILER-TUBE.

Specification of Letters Patent.

Patented July 13, 19915.

Application filed September 17, 1912. Serial No. 720,861.

To all whom it may concern:

Be it known that I, FRANK BURKETT, a citizen of the United States,residing at Lufkin, in the county of Angelina and State of Texas, haveinvented a new and useful Boiler-Tube, of which the following is aspecification.

The present invention relates to improvements in boiler tubes, theprimary object of this invention being the provision of a noncorrodiblesheet engaging end for the tube, the same being so constructed andarranged as to be readily sweated or brazed to the usual steel or ironboiler tube, such construction reducing the cost of installation andremoval and at the same time a more durable securing means between thetube and sheet.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed can be made within thescope of what is claimed without departing from the spirit of theinvention.

In the drawingsFigure 1 is a sectional View through a boiler sheet withone of the boiler tubes attached thereto. Fig. 2 is a longitudinalsectional view through the boiler tube adjacent to the non-corrodibleend thereof.

Referring to the drawings, the numeral 1 designates the boiler sheet and2 the tube. The steel section 3 of the tube is slightly tapered as at 4for the reception of the inner tapered end 6 of the non-corrodible sheetengaging tube or end 7, which is preferably made of copper or amalleable non-corrodible metal having the same qualities as copper. Themeeting ends of the section 3 and end 7 are brazed by suitable brazingmetal 5 and thus a homogeneous junction isproduced between the copperand steel, as clearly shown in Fig. 2. As shown in Fig. 1, the extremeouter end of the non-corrodible section 7 is expanded as at 8 and thusprovides a water t1ght joint between the tube and sheet, and a meanswhereby the tubes may be readily removed and replaced when necessary.

Bv constructing the ends of boiler tubes as herein set forth, a strongtube is produced, and as the connection with the boiler sheet is made byexpanding the malleable non-corrodible connecting end therewith, it isevident that the cost of installation as well and the initial cost ofthe tube is reduced.

With the present boiler tube, the sudden contraction and expansion thatoften cracks and breaks steel and iron tubes, does not have this badeffect, and thus this tube is more durable and inexpensive in use.

What is claimed is:

A boiler tube, including a main section having its end taperedexteriorly to a relatively thin rim, a non-corrodible boiler sheetengaging nipple, one end of which is of a reduced diameter, but thethickness of the walls of which are the same throughout, a portion ofsaid end being inserted within and out of contact with the mouth of themain section, and a uniting brazing metal filling the circumferentialspace between the telescopic portion of the main section and the nippleand surrounding the nipple as a continuation of the tapered relativelythin rim of the main section, whereby a reinforced and water tight jointis provided both by the incased end of the nipple and the uniting metalabout the nipple.

In testimony that I claim the foregoing as my own, I have hereto afiixedmy signature in the presence of two witnesses.

FRANK BURKETT.

Witnesses:

W. L. EFFINGER, O. H. WEISE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner oflatents, Washington, I). G.

